Dear all,
I'm having some issue with my application.

Basically I have a form where I'm initializing a datagridview. From this form I'm the loading another form (without closing the first form) where I have another datagridview which loads data from the same table of the other datagridview.

Here below the code of the first form:

Private Sub Analisi_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'CTO_ManagementDataSet7.Tbl_CTOPartiteOss' table. You can move, or remove it, as needed.
Me.Tbl_CTOPartiteOssTableAdapter.Fill(Me.CTO_ManagementDataSet7.Tbl_CTOPartiteOss)
'TODO: This line of code loads data into the 'CTO_ManagementDataSet6.Tbl_CTOSquadre' table. You can move, or remove it, as needed.
Me.Tbl_CTOSquadreTableAdapter.Fill(Me.CTO_ManagementDataSet6.Tbl_CTOSquadre)

DtGrdSquadreOss.SelectionMode = DataGridViewSelectionMode.FullRowSelect
DtGrdPartiteOss.SelectionMode = DataGridViewSelectionMode.RowHeaderSelect

End Sub

While here the code of the second one:

Private Sub Details_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'CTO_ManagementDataSet.Tbl_CTOPartiteOss' table. You can move, or remove it, as needed.
Me.Tbl_CTOPartiteOssTableAdapter.Fill(Me.CTO_ManagementDataSet.Tbl_CTOPartiteOss)

End Sub

Now, as said, when loading the second form I'm getting the following error: "System.Data.ConstraintException: 'Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.' "

I believe it is because the first form is not closed. Any suggestion?

Thanks,
A.